The Department of Homeland Security (DHS) is required by statute to develop and implement a biometric entry-exit data system. To facilitate the implementation of a seamless biometric entry-exit system that uses facial recognition and to help prevent persons attempting to fraudulently use U.S. travel documents and identify criminals and known or suspected terrorists, DHS is proposing to amend the regulations to provide that all travelers, including U.S. citizens, may be required to be photographed upon entry and/or departure.